Heavy teal and black vase with deep incised lines. Approximately 15.2cm tall (6 inches), 10 cm wide (4 inches) and weighs 660 grams (1 pound 7 ounces). It has 2 distinct chop markings on the bottom but I have been unable to identify the maker. Marked with "S.T." inside of a circle and another circle with 4 leaves or feathers.Any help on the maker would be appreciated.Thank you,Edward